I have found something very unusual with my recently purchased 1968 6hp Johnson (CDL-25c). There's no pin and no hole to take a pin near the top of the driveshaft, the one which compresses the various components of the crankcase seal. This means it's been running with little or no seal. Could it be that someone's fitted a driveshaft from an older model? I understand that they used to have a different setup and the slotted ledge / pin assembly was only added after a certain year.
I'm keen to rectify this and aim to drill a hole and fit a stainless roll pin, but I need to know where the pin needs to be located relative to the driveshaft - and also approximately what diameter of hole is needed? I've done some working out from the drawings on the BRP website and from the service manual, but not sure if these are to scale and they also look to be from an offset angle. However I've worked out the distance between the impeller pin and the top pin to be about 371 mm. This might be close enough given that all the pin needs to do is compress the spring which forms the seal (+/- 1 or 2 mm maybe ok??), but an actual measurement is what's really needed! If anyone can help me with this it would be very much appreciated!
Many thanks,
Roger
PS This topic was mentioned in a previous post about a cooling problem, but as this is a separate issue and quite a big one I thought it made sense to create a new thread so as to highlight the issue.
I'm keen to rectify this and aim to drill a hole and fit a stainless roll pin, but I need to know where the pin needs to be located relative to the driveshaft - and also approximately what diameter of hole is needed? I've done some working out from the drawings on the BRP website and from the service manual, but not sure if these are to scale and they also look to be from an offset angle. However I've worked out the distance between the impeller pin and the top pin to be about 371 mm. This might be close enough given that all the pin needs to do is compress the spring which forms the seal (+/- 1 or 2 mm maybe ok??), but an actual measurement is what's really needed! If anyone can help me with this it would be very much appreciated!
Many thanks,
Roger
PS This topic was mentioned in a previous post about a cooling problem, but as this is a separate issue and quite a big one I thought it made sense to create a new thread so as to highlight the issue.